Wind Pressures on End-Cell-Induced Vibrationof Circular Tower
Publication: Journal of Engineering Mechanics
Volume 127, Issue 11
Abstract
In the case of a circular tower, end-cell-induced vibration (ECIV) occurs at a wind speed a few times higher than the wind speed that induces the vortex-induced vibration. To elucidate the characteristics of the aerodynamic forces due to tip-associated vortices (TAV), which are considered as the cause of ECIV, wind pressures acting on a rigid circular tower were measured in a wind tunnel. The pressure fluctuations due to TAV were detected near the free end of the tower. It is shown that the frequency of fluctuating pressure due to TAV is much lower than that due to the von Kármán vortex sheddings and TAV is generated nonalternately. Also, included in this study are numerical analyses using the measured pressures as fluctuating lift forces; the predicted amplitudes of ECIV for a rocking circular cylinder agree with the amplitudes obtained in the wind tunnel experiments. If a thin circular disk is attached to the model top, the amplitudes of ECIV decrease with the increase of the disk diameter. The reason for this phenomenon is clarified.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 127 • Issue 11 • November 2001
Pages: 1135 - 1143
History
Received: Apr 5, 2000
Published online: Nov 1, 2001
Published in print: Nov 2001
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